Dodge Intrepid Service Manual page 960

LH
DISTRIBUTION
DESCRIPTION
DESCRIPTION - HVAC SYSTEM AIRFLOW
DESCRIPTION - HVAC FORCED
RECIRCULATION . . . . . . . . . . . . . . . . . . . . . . 23
OPERATION - HVAC SYSTEM AIRFLOW
BLOWER MOTOR
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 23
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
DISTRIBUTION
DESCRIPTION
DESCRIPTION - HVAC SYSTEM AIRFLOW
The system draws outside air through the cowl
opening at the base of the windshield. Then it goes
into the plenum chamber above the HVAC unit hous-
ing and passes through the evaporator. At this point
airflow can be directed either through or around the
heater core.
DESCRIPTION - HVAC FORCED
RECIRCULATION
The Body Control Module (BCM) receives a Pro-
grammable Communications Interface (PCI) bus mes-
sage from the Powertrain Control Module (PCM)
with the feedback from the A/C Pressure Transducer.
The BCM will force the system into the Recirculation
mode, reducing the A/C refrigerant pressure under
these extreme conditions. The reduced operating
pressure offers improved A/C system performance
and reduced wear on A/C components.
OPERATION - HVAC SYSTEM AIRFLOW
Airflow temperature can be adjusted by the blend
door with the TEMP control on the a/c heater control.
After the air passes the blend door, the air flow is
then directed from the PANEL, BI-LEVEL (panel
and floor), and FLOOR-DEFROST outlets. Air flow
velocity can be adjusted with the blower speed selec-
tor switch on the a/c heater control.
Ambient air intake can be shut off by closing the
recirculation door. This will recirculate the air that is
already inside the vehicle. See owners manual for
recirculation operation.
DISTRIBUTION
TABLE OF CONTENTS
page
INSTALLATION
HVAC HOUSING
. . 23 REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
DISASSEMBLY
ASSEMBLY
. . . . . 23 INSTALLATION
INSTRUMENT PANEL DEMISTER DUCTS
DESCRIPTION
OPERATION
BLOWER MOTOR
DESCRIPTION
The blower motor and blower wheel are located in
the passenger side end of the HVAC housing, below
the glove box module. The blower motor controls the
velocity of the air flowing through the HVAC housing
by spinning a squirrel cage-type blower wheel within
the housing at the selected speed. The blower motor
and blower wheel can be serviced from the passenger
compartment side of the housing.
OPERATION
The blower motor will only operate when the igni-
tion switch is in the On position, and the a/c heater
mode control switch is in any position, except off. The
blower motor circuit is protected by a fuse in the
junction block. On models with the standard manual
temperature control system, the blower motor speed
is controlled by regulating the battery feed through
the blower motor switch and the blower motor resis-
tor. On models with Automatic Temperature Control
(ATC) system, the blower motor speed is controlled
by using a linear blower controller with a pulse
width modulation input. The blower motor power
module adjusts the battery feed voltage to the blower
motor, based upon an input from the blower motor
switch, through the ATC control module. Pulse width
modulation of blower power allows the blower to
operate at any speed from stationary, to full speed.
The blower motor and blower motor wheel cannot
be repaired, and if faulty or damaged, they must be
replaced. The blower motor and blower wheel are not
serviced separately and must be replaced as an
assembly.
DISTRIBUTION 24 - 23
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